Currently instances of this class are used to allow proper serialization of ResultSources (which may contain unserializable elements like CODE references).

Originally this module was used to remove the fixed link between Rows/ResultSets and the actual result source objects in order to obviate the need of keeping a schema instance constantly in scope,
while at the same time avoiding leaks due to circular dependencies.
This is however no longer needed after introduction of a proper mutual-assured-destruction contract between a Schema instance and its ResultSource registrants.